The role of excited atoms in UV photopreionization TEA lasers

The role of excited atoms in UV photopreionization TEA lasers

A simple model of photoionization of excited atoms by UV photons from capacitor spark discharges is suggested to explain the improvement in both plasma density production and laser efficiency noticed by several investigators when the proportion of helium in high-pressure CO 2 laser mixtures is incre...

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Bibliographische Detailangaben
Veröffentlicht in:IEEE J. Quant. Electron.; (United States) 1977-12, Vol.13 (12), p.968-972
Hauptverfasser: Kopeika, N., Kushelevsky, A.
Format: Artikel
Sprache:eng
Schlagworte:
420300 - Engineering- Lasers- (-1989)
ADDITIVES
Atom lasers
Atomic beams
Capacitors
CARBON DIOXIDE LASERS
CRYOGENIC FLUIDS
DENSITY
ELEMENTS
ENERGY LEVELS
ENGINEERING
EXCITED STATES
FLUIDS
GAS LASERS
HELIUM
HIGH PRESSURE
IONIZATION
Laser excitation
Laser modes
LASERS
NONMETALS
PHOTOIONIZATION
PHYSICAL PROPERTIES
PLASMA
Plasma density
Production
RARE GASES
Sparks
TUNING
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Beschreibung
Zusammenfassung:A simple model of photoionization of excited atoms by UV photons from capacitor spark discharges is suggested to explain the improvement in both plasma density production and laser efficiency noticed by several investigators when the proportion of helium in high-pressure CO 2 laser mixtures is increased. Such improvements with increased He proportion take place both with and without seeding with low ionization potential dopants. The model is also applicable to explaining the arc suppression qualities of helium as well as the ability to ignite discharges at higher total pressures when the proportion of helium is increased. Several implications regarding future TEA laser work are suggested.
ISSN:0018-9197
1558-1713
DOI:10.1109/JQE.1977.1069264